My car, round 3

Today me and mom went out to look at some local dealerships for a car and we came upon one dealership that had a beautiful infiniti for 3900. We went inside to talk to the man about it and he said since we were going to pay cash out right that he could lower the price to 3400 so we were really excited about that. However my mom was unsure of the quality of the car so we called my grandad and he told us that infiniti was made by nissan so the engines were good, which was great news to me. After finding out this information me and mom took it for a test drive to my uncle's house. It handled like a dream and had a V6 engine so needless to say it got it done on the straight aways. So we arrived at my uncles house and he, being a police officer, took the car for a real test drive. He took turns really hard, and floored it in all straight aways checking to see if any problems occured. The car passed completely however we did notice a check engine light was on in the car so we went to check it out at auto-zone but they did not have the equpment to check the car. So reluctantly we drove the car back and told the man about the problem and he said he would have his shop take a look at it and tell us before noon tomorrow.